SE123780C1

SE123780C1 -

Info

Publication number: SE123780C1
Authority: SE
Publication date: 1948-01-01

Description

KLASS 55 b:5/ BESKRIVN1NG OFFENTLIGG3ORD AV KUNGL. PATENT- OCH REG1STRERINGSVERKET BEVIDAT DEN 11 NOVEMBER 1948 PATENTTID FRAN DEN 4 JUNI 1945 PUBLICERAT DEN 11 JANUAR! 1949 Ans. den 4/G 1945, nr 4387/1945. Harlin en ritning. CLASS 55 b: 5 / DESCRIPTION PUBLIC WORD BY KUNGL. PATENT AND REGISTRATION AGENCY GRANTED ON 11 NOVEMBER 1948 PATENT PERIOD FROM 4 JUNE 1945 PUBLISHED ON 11 JANUARY! 1949 Ans. den 4 / G 1945, nr 4387/1945. Harlin a drawing.

B. NYQUIST, DYNAS. B. NYQUIST, DYNAS.

Farfaringssatt vid tvattning av material, t. ex cellulosamassa I en diffusiir och darfor avsedd anordning. Experienced in the washing of materials, eg cellulose pulp, in a diffuser and dedicated device.

Vid avskiljning av den vid sulfatcellulosakokning erhallna a-vfallsluten, svartluten, frau cellulosamassan, anvandas vanligen diffusOTer. En diffusor fir ett cylindriskt, stAende platkarl med kupad topp och batten. Strax ovanfOr bottnen finnes en mellanbotten av silpldt. Diffusorerna goras i allmanhet cirka 10 % mindre till volymen an den. tillhOrande kokaren och beraknas da vara tillrackligt storo for att rymma ett kok av den vataste massaved, som kan forekomma. Vid kokning av torrare ved blir diffusOren icke full, nar koket inblases i densamma. When separating the a-waste liquor, the black liquor obtained from sulphate cellulose boiling, from the cellulose pulp, diffusers are usually used. A diffuser for a cylindrical, standing flat panel with a cupped top and batten. Just above the bottom is a middle bottom of silpldt. The diffusers are generally made about 10% smaller in volume than that. belonging to the boiler and is then calculated to be sufficiently large to accommodate a boiler of the wettest pulpwood that may occur. When boiling drier wood, the diffuser does not become full when the boil is blown into it.

Nar svartluten avskiljes fran massan i diffusoren, d. v. s. nar tvattningen ager rum, tillgar detta pa foljande satt: Diffus8ren fylles med tunn svartlut fran en bredvidstaende, nastan fardigtvattad diffusor, och locken pa dess topp tillslutas, varefter diffusoren sat-Les under tryck. Genom ,silbottnen, och genom ett Tor fran rummet mellan silbottnen och bottengaveln undantranges luten ur massan. Den i toppen ingaende svagluten blir svagare, och nar den diffusor, som derma lut kommer ifran, anses ren, omkopplas till varmvatten. När behandling med varmvatten dgt rum tillrackligt lange, Mir luten sh svag, att den i sin tur anvandes for tvattning av nasta diffusOr o. s. v. Under tvattningen sjunker massafyllningens ovre yta. Medan tvattningen gar, finnes upptill i diffusOren ett mindre eller storre rum, som ãr fyllt med enbart vatska, till en borjan tunn svarthrt och slutligen vatten. Genom de stromningar, som forekomma i detta rum, blir luten frhn diffusOren utspadd till men for ekonomien i fabrikens lutindunstning. Dessutom blir forbrukningen av varmvatten stor och tvfittiden lang. When the black liquor is separated from the mass in the diffuser, i.e. when the washing takes place, this is added in the following way: The diffuser is filled with thin black liquor from an adjacent, almost ready-washed diffuser, and the lids on its top are closed, after which the diffuser is placed under pressure. Through, the sieve bottom, and through a Tor from the room between the sieve bottom and the bottom gable, the liquor was displaced from the mass. The weak liquor entering the top becomes weaker, and when the diffuser from which this liquor comes is considered clean, it is switched to hot water. When treatment with hot water dgt room sufficiently long, Mir luten sh weak, that it in turn was used for washing the nearest diffuserOr, etc. During the washing, the upper surface of the pulp filling sinks. While the washing is going on, there is at the top of the diffuser a smaller or larger room, which is filled with only liquid, to a initially thin black hair and finally water. Due to the currents which occur in this room, the liquor from the diffuser is diluted to the detriment of the economy in the factory's liquor evaporation. In addition, the consumption of hot water is large and the TV service time is long.

Dessa olagenheter undanrolas enligt foreliggande uppfinning, som avser ett forfarande vid tvattning av material, t. ex. cellulosamassa eller betsnitsel, i en diffussor och som kannetecknas darav, ,att upptill i diffusOren ovanfor vatskeytan anordnas en gaskudde, som genom tillforsel av tryckgas, alltefter som materialet i diffusOren sjunker, upprfittsa att blott ett tunt skikt av enbart vatska tacker materialet. Begynnelsestorle- ken pa gaskudden eller luftkudden bestammes alltsa av diffusorens fyllningsgrad. Allteftersom materialet sjunker okas kuddens storlek. Uppfinningen avser Even en anord- ning for utforande av fOreliggande forfarande, vilken kannetecknas darav, att den bestar av en utanfOr en diffusor amordnad ledning, som fOrbinder rummet Over vatskeytan med vatskan i diffusOren och av ett till ,denna ledning anslutet impulsorgan, ,som ar anordnat att paverka en ventil i en ledning for tillf Orsel av tryckgas till diffus5rens topp. These imperfections are eliminated according to the present invention, which relates to a process for washing materials, e.g. cellulose pulp or pickling, in a diffuser and which can be characterized therefrom, that at the top of the diffuser above the water surface a gas cushion is arranged, which by supply of pressurized gas, as the material in the diffuser sinks, is arranged to cover only a thin layer of liquid only. The initial size of the gas cushion or air cushion is thus determined by the degree of filling of the diffuser. As the material decreases, the size of the pillow increases. The invention also relates to a device for carrying out the present method, which is characterized in that it consists of a line arranged outside a diffuser, which connects the space above the water surface with the liquid in the diffuser and of an impulse means connected to this line, which is arranged to actuate a valve in a line for the supply of pressurized gas to the top of the diffuser.

A bifogade ritning askadliggores en utfo- ringsform av en anordning enligt uppfinningen, avsedd f Or tvattning av sulfatmassa. Figuren visar en vertikalsektion genom en diffusor. 1 betecknar en diffusor, som fir forsedd med en ledning 2 for inblasning av mas- sa och ledningar 3, 4 for inledningtvatt- lut rasp. varmvatten. I diffus5rens batten ãr anbragt en sil 5 och avlopp 6, 7. for massa resp. lut. Fran diffusorens topp utgar en ledning 8, soin star i forbindelse med ett nivakarl 9, vilket i sin tur fir anslutet till en ledning 10, som inmynnar i diffusoren pa ett som alltid ar belaget under vatskeni- van vid tvattningen. Ledningarna 9 och 10 aro vid anslutningsstallena till diffusOren forsedda med silorgan. Nivakarlet kan over en katting 11 paverka en regulator 12, vilken genom en servomotor kan omstfilla en ventil 13 i en tryckluftledning 14, som star i forbindelse med diffusorens topp. The accompanying drawing illustrates an embodiment of a device according to the invention, intended for washing sulphate pulp. The figure shows a vertical section through a diffuser. 1 denotes a diffuser which is provided with a conduit 2 for blowing in pulp and conduits 3, 4 for initial watering rasp. hot water. In the diffuser bath is placed a sieve 5 and drain 6, 7. for mass resp. lye. From the top of the diffuser there is a line 8, which is connected to a level vessel 9, which in turn is connected to a line 10, which opens into the diffuser on one which is always covered under the water rail during washing. The lines 9 and 10 are provided at the connection stalls to the diffusers with screen means. The leveling vessel can actuate a regulator 12 via a cat 11, which through a servomotor can switch a valve 13 in a compressed air line 14, which is connected to the top of the diffuser.

Sedan massan genom ledningen 2 inblasts pa diffusOren 1, mates avstandet Iran diffusorens topp till massaskiktet med tillhj alp av organet 15. Nivakarlet installes darefter pa den daremot svarande lampliga hojden. Regulatorn pa'verkas av nivakarlets tyngd och hailer med tillhjalp av tryckluften konstant vatskehojd i nivakarlet och darmed aven i diffusOren. Efter hand som massans ovre yta ,sjunker I diffusOren, sankes nivakarlet, genom att kattingen forlanges, och dfirmed sjunker Even vfitskeytan i diffusOren. Denna successiva sankning av nivhkarlet kan astadkommas med tillhjälp ,av exempelvis ett urverk,. 2— — De heldragna linjerna 16 antyda vatskeytan och massahojden vid tvattningens borjan och de streckprickade 17 yid tvattningens slut. After the mass has been blown in through the line 2 on the diffuser 1, the distance Iran is fed to the top of the diffuser to the mass layer with the aid of the member 15. The level vessel is then installed at the corresponding lamp height. The regulator is affected by the weight of the level vessel and hails with the help of the compressed air constant liquid height in the level vessel and thus also in the diffuser. As the upper surface of the pulp sinks in the diffuser, the level vessel sinks as the kitten is required, and thus the even surface of the mass sinks in the diffuser. This successive lowering of the level vessel can be effected with the aid of, for example, a clockwork. 2— - The solid lines 16 indicate the water surface and the mass height at the beginning of the washing and the dashed dots 17 at the end of the washing.

Claims

Patent claim:

Procedure yid washing materials, e.g. cellulose pulp, in a diffuser, in the top of which wash water is introduced, while the liquid to be dispensed emits at the bottom through a sieve bottom, characterized in that at the top of the diffuser above the water surface a gas cushion is arranged, which by supply of pressurized gas as the material sinks upright les, said that Mott a thin layer of, only liquid constantly thanks the material.

Device for carrying out the method according to claim 1 in a diffuser with inlet for material and wash water at the top and through a sieve separate drains for material and liquid at the bottom, characterized in that it consists of a conduit arranged outside the diffuser, which connects the space above the water surface. with the liquid in the diffuser () eh of an impulse means connected to this line, which is arranged to actuate one. valve in a line for supplying pressurized gas to the top of the diffuser, so that as the material in the diffuser sinks only a thin layer of only liquid_ tackles the material.